问题描述：
    在docker容器中运行一个k3s集群，启动一个Pod，指定其hostPort字段为80端口，更新Deploy后Pod为Pending状态，无法启动，Status为当前node上端口被占用
    环境:
    suseLinux

    检查端口占用情况

    zypper install net-tools

    1. Deprecated Tool       Alternative Tool
    2. arp                                ip n
    3. ifconfig                        ip a
    4. ipmaddr                      ip maddr
    5. iptunnel                      ip tunnel
    6. netstat                        ss
    7.                                    ip route (netstat -r)
    8.                                    ip -s link (netstat -i)
    9. route                           ip r
    10. mii-tool                      ethtool
    11. nameif                        ifrename

    使用ss查看端口占用情况
    ss -alnp|grep 8888
    发现没有监听

    查看iptables
    zypper install iptables

    kubectl get po -owide
    查看到前端服务对应的Pod ip为10.42.1.17

    zypper install iproute2

    https://commandnotfound.cn/linux/1/232/ss-%E5%91%BD%E4%BB%A4
    https://blog.csdn.net/weixin_41282397/article/details/85705848
    https://blog.csdn.net/samson_www/article/details/80377431

    k8s中的hostPort
    https://developer.aliyun.com/article/796076

    https://www.cnblogs.com/sztom/p/10810508.html